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Commit 921eebdc authored by Karsten Wiese's avatar Karsten Wiese Committed by Takashi Iwai
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ALSA: snd-usb-us122l: Fix MIDI output 



The US-122L always reads 9 bytes per urb unless they are set to 0xFD.

Signed-off-by: default avatarKarsten Wiese <fzu@wemgehoertderstaat.de>
Cc: stable@kernel.org
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent d1d7093f

sound/usb/midi.c

+9 −2
Original line number Diff line number Diff line
@@ -850,8 +850,8 @@ static void snd_usbmidi_us122l_output(struct snd_usb_midi_out_endpoint *ep, 
		return;

	}



	memset(urb->transfer_buffer + count, 0xFD, 9 - count);

	urb->transfer_buffer_length = count;

	memset(urb->transfer_buffer + count, 0xFD, ep->max_transfer - count);

	urb->transfer_buffer_length = ep->max_transfer;

}



static struct usb_protocol_ops snd_usbmidi_122l_ops = {
@@ -1295,6 +1295,13 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi, 
	case USB_ID(0x1a86, 0x752d): /* QinHeng CH345 "USB2.0-MIDI" */

		ep->max_transfer = 4;

		break;

		/*

		 * Some devices only work with 9 bytes packet size:

		 */

	case USB_ID(0x0644, 0x800E): /* Tascam US-122L */

	case USB_ID(0x0644, 0x800F): /* Tascam US-144 */

		ep->max_transfer = 9;

		break;

	}

	for (i = 0; i < OUTPUT_URBS; ++i) {

		buffer = usb_alloc_coherent(umidi->dev,